EMC-CS-2009.1 is the Ford electromagnetic compatibility component specification, and its designator shows how the manufacturer has named its requirements: the letters identify the document as an electromagnetic compatibility component specification, and the year together with the decimal indicates the generation of the requirement, so that a later generation carries a later year rather than a revision letter. The North American automotive companies have generally written their component requirements with a strong emphasis on the disturbance a component emits, because the vehicles they build carry a wide range of receivers and because the regulatory responsibility for the emissions of digital devices rests with the manufacturer. The specification is cited in the supplier's engineering documents, and the manufacturer maintains an accepted laboratory list on which the test must be performed. A supplier preparing a test plan should therefore confirm both the generation of the specification and the list of accepted laboratories before the schedule is fixed, because a facility that is not on the list cannot be used however capable it is.